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Responses of arbuscular mycorrhizal fungi to long-term inorganic and organic nutrient addition in a lowland tropical forest.

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Title: Responses of arbuscular mycorrhizal fungi to long-term inorganic and organic nutrient addition in a lowland tropical forest.
Authors: Sheldrake, Merlin1,2 merlinsheldrake@gmail.com, Rosenstock, Nicholas P.3, Mangan, Scott2,4, Revillini, Daniel5, Sayer, Emma J.2,6, Olsson, Pål Axel7, Verbruggen, Erik8, Tanner, Edmund V. J.1, Turner, Benjamin L.2, Wright, S. Joseph2
Source: ISME Journal: Multidisciplinary Journal of Microbial Ecology. Oct2018, Vol. 12 Issue 10, p2433-2445. 13p.
Abstract: Improved understanding of the nutritional ecology of arbuscular mycorrhizal (AM) fungi is important in understanding how tropical forests maintain high productivity on low-fertility soils. Relatively little is known about how AM fungi will respond to changes in nutrient inputs in tropical forests, which hampers our ability to assess how forest productivity will be influenced by anthropogenic change. Here we assessed the influence of long-term inorganic and organic nutrient additions and nutrient depletion on AM fungi, using two adjacent experiments in a lowland tropical forest in Panama. We characterised AM fungal communities in soil and roots using 454-pyrosequencing, and quantified AM fungal abundance using microscopy and a lipid biomarker. Phosphorus and nitrogen addition reduced the abundance of AM fungi to a similar extent, but affected community composition in different ways. Nutrient depletion (removal of leaf litter) had a pronounced effect on AM fungal community composition, affecting nearly as many OTUs as phosphorus addition. The addition of nutrients in organic form (leaf litter) had little effect on any AM fungal parameter. Soil AM fungal communities responded more strongly to changes in nutrient availability than communities in roots. This suggests that the ‘dual niches’ of AM fungi in soil versus roots are structured to different degrees by abiotic environmental filters, and biotic filters imposed by the plant host. Our findings indicate that AM fungal communities are fine-tuned to nutrient regimes, and support future studies aiming to link AM fungal community dynamics with ecosystem function. [ABSTRACT FROM AUTHOR]
Copyright of ISME Journal: Multidisciplinary Journal of Microbial Ecology is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Responses of arbuscular mycorrhizal fungi to long-term inorganic and organic nutrient addition in a lowland tropical forest.
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  Data: <searchLink fieldCode="AR" term="%22Sheldrake%2C+Merlin%22">Sheldrake, Merlin</searchLink><relatesTo>1,2</relatesTo><i> merlinsheldrake@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Rosenstock%2C+Nicholas+P%2E%22">Rosenstock, Nicholas P.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Mangan%2C+Scott%22">Mangan, Scott</searchLink><relatesTo>2,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Revillini%2C+Daniel%22">Revillini, Daniel</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Sayer%2C+Emma+J%2E%22">Sayer, Emma J.</searchLink><relatesTo>2,6</relatesTo><br /><searchLink fieldCode="AR" term="%22Olsson%2C+Pål+Axel%22">Olsson, Pål Axel</searchLink><relatesTo>7</relatesTo><br /><searchLink fieldCode="AR" term="%22Verbruggen%2C+Erik%22">Verbruggen, Erik</searchLink><relatesTo>8</relatesTo><br /><searchLink fieldCode="AR" term="%22Tanner%2C+Edmund+V%2E+J%2E%22">Tanner, Edmund V. J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Turner%2C+Benjamin+L%2E%22">Turner, Benjamin L.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Wright%2C+S%2E+Joseph%22">Wright, S. Joseph</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22ISME+Journal%3A+Multidisciplinary+Journal+of+Microbial+Ecology%22">ISME Journal: Multidisciplinary Journal of Microbial Ecology</searchLink>. Oct2018, Vol. 12 Issue 10, p2433-2445. 13p.
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  Label: Abstract
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  Data: Improved understanding of the nutritional ecology of arbuscular mycorrhizal (AM) fungi is important in understanding how tropical forests maintain high productivity on low-fertility soils. Relatively little is known about how AM fungi will respond to changes in nutrient inputs in tropical forests, which hampers our ability to assess how forest productivity will be influenced by anthropogenic change. Here we assessed the influence of long-term inorganic and organic nutrient additions and nutrient depletion on AM fungi, using two adjacent experiments in a lowland tropical forest in Panama. We characterised AM fungal communities in soil and roots using 454-pyrosequencing, and quantified AM fungal abundance using microscopy and a lipid biomarker. Phosphorus and nitrogen addition reduced the abundance of AM fungi to a similar extent, but affected community composition in different ways. Nutrient depletion (removal of leaf litter) had a pronounced effect on AM fungal community composition, affecting nearly as many OTUs as phosphorus addition. The addition of nutrients in organic form (leaf litter) had little effect on any AM fungal parameter. Soil AM fungal communities responded more strongly to changes in nutrient availability than communities in roots. This suggests that the ‘dual niches’ of AM fungi in soil versus roots are structured to different degrees by abiotic environmental filters, and biotic filters imposed by the plant host. Our findings indicate that AM fungal communities are fine-tuned to nutrient regimes, and support future studies aiming to link AM fungal community dynamics with ecosystem function. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of ISME Journal: Multidisciplinary Journal of Microbial Ecology is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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